Zipper lock



FIG. 1 is a front perspective view of a zipper lock wherein the latch is shown in locked position showing my new design;

FIG. 2 is a front perspective view thereof, with the latch is shown in alternate and unlocked position;

FIG. 3 is a rear perspective view thereof, with the latch is shown in alternate and unlocked position; and,

FIG. 4 is another rear perspective view thereof, similar to FIG. 3.

The broken lines are included for the purpose of illustrating the environment and forms no part of the claimed design. 

CLAIM The ornamental design for a zipper lock, as shown and described. 